Cutting-off device for glass-drawing apparatus



W. E. STANDLEY.

VICE FOR GLASS DRAWING APPARATUS.

0 Aue.-20',191s.

CUTTING OFF 0 RENEWED MAR. 13, I920.

APPLICATION FlL Patented Apr. 27, 1920.

FIG.

WITNESSES W INVENTOR UNITED STATES PATENT OFFICE, f

WILLIAM E. STANDLEY, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WINDOW GLASS ROTARY POT COMPANY, A CORPORATION OF PENNSYLVANIA.

CUTTING-OFF DEVICE FOR GLASS-DRAWING APPARATUS. I

Specification of Letters Patent.

Patented Apr. 27, 1920.

Application filed August 20, 1915, Serial No. 46,442. Renewed March 13, 1920. Serial No. 365,625.

To all whom it may concern:

Be it known that I WILLIAM E. STAND- LEY, a citizen of the resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Im rovement in Cutting-Off Devices for Glassrawing Apparatus, of which the following is a specification. V

This invention relates to cutting off devices for glass drawing apparatus, and particularly to devices for cutting off from the remaining material in the pot the glass cylinder drawn from the pot by the usual bait drawing head. The object of the invention is to provide a simple form of cutting of! device which is easily operated, which severs the glass along a regular line, and which is of a nature to cooperate with the bait in cooling or chilling the glass for attaching it to the bait at the beginning of the drawing operation. A further object of the invention is to provide a device of this kind which can be manufactured at low cost and which is protected from the heat of the furnace so that it is durable and is not liable to burn out in service. Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

In the drawings, Figure 1 is a sectional elevation through one form of glass furnace with the invention applied thereto; Fig. 2 is an enlarged detail section through the cutting off ring; and Fig. 3 is a plan view of said ring, partly in section.

The furnace as shown in the drawings for purposes of illustration comprises a hearth 1 on whichis located the pot 2, said furnace being heated by gas or in any other manner, as desired. Above the furnace is a frame 3 along which slides vertically a carriage 4 carrylng the bait or drawing head 5 connected to a shaft 6 telescoping through a stufling-box into a larger pipe 7 connected to a source of compressed air 8. This structure is more fully described in the copending application filed by myself-and Thomas B. Campbell for glass drawing and blowing apparatus, of even date herewith, Serial No. 46,441, and need not be further described, as

y it forms no part of the present invention.

After the glass cylinder is drawn'from the pot by the bait in the usual manner, it is necessary to cut off the cylinder from any glass remaining in the pot. For this pur- United States, and a inner wall on either side of a partition 15 therein. This ring with the pipes 14 at tached thereto is placed in the mold for casting the outer wall 12, in the same manner as the core is placed in said mold, so that in the casting operation the inner wall is cast into the outer wall, leaving the pi es 14 projecting through said outer wall. he outer wall is larger than the inner wall so as to leave a space 16 between said walls, for a purpose to be described.

The pipes 14 form a connection for conducting a supply of gas to the space 15 within the inner wall and are therefore coupled to a conduit (not shown) leading to a gas supply. This gas supply is directed against the outer surface of the glass cylinder for cutting off the same, and passes out from the space 15 through a series ofsuitable outlets 18 spaced at intervals around the inner surface of the ring and shown as formed of small nozzles or pipe members passing through openings in the outer ring and screwed into tapped openings in the inner ring. At the conclusion of the drawing operation the gas supply is turned on, so that a circular sheet of flame is directed against the glass cylinder, which melts the same along a regular line and severs it from the remaining glass in the pot.

The double walled construction of the cutting ofl' ring protects it from the injurious effects of the high temperature, but it is preferably cooled by a water supply introduced to the hollow space 16 between the two walls 11 and 12. As shown, said space is divided at one point in its periphery by a cross wall or partition 19, and the water supply is conducted to one end of said space through a conduit 20. The outlet from said space is at the other end of said space on the other side of the-wall 19 through a conduit 22, so that the current of water flows entirely around the ring before it leaves it.

The ring is preferably supported from above so that it ma be raised and lowered for purposes of a justment and to allow manipulation of the pot or furnace. As shown, it is provided on opposite sides with upwardly extending rods 23 connected to cables 24 passing over a pulley to a winding drum, which may be operated by -a hand wheel or in any other manner.

The ring lies in a position directly opposite the drawing head or bait 5, which is above the upper edge of the pot. It is of cast metal and is comparatively massive, so that it absorbs and conducts away the heat of the glass clinging to the bait and thereby assists in chilling the same and attaching it to the bait.

It will be noted that the ring covers the edges of the glass pot and seals the openings around the sides of the pot and also incloses the space in the furnace immediately above the glass pot. In furnaces of the character with which this improvement is used, the space or head room above the pot, when the furnace is being operated, is filled with hot gases which, when a cylinder is drawn from the pot, will strike the cylinder and either break it or cause it tobulge, unless some means is employed to prevent the gases striking the cylinder. The ring 10, which constitutes a cooling and a cutting-off device, also serves the function of protecting the glass cylinder against these gases. t is made of proper size to inclose -the space he 1 tween the glass pot over which it is positioned and the cap of the furnace and it fur- "'ther seals the gas passages around the outside of the glass pot. Consequently, when this ring is lowered to position, it prevents the hot gases from striking the cylinder of glass that is being drawn and thereby prevents the gases from striking and destroying the cylinder.

he glass cylinders which are drawn with a machine of this kind are often 30 feet long and the amount of glass will weigh 250 pounds. If the cylinder is broken in some way by the action of gases striking it so that it falls back into the glass pot, the glass will strike the edge of the pot and break it to pieces. This not only causes a loss of the glass pot but stops the machine and requires a cleaning out of the glass which is scattered throughout it. When the cooling and cutting-off device herein disclosed is used, however, it covers the edge of the glass pot, and in the event that a cylinder should fall it cannot strike the edge of the pot but hits the molten glass body in the pot and is cushioned to such an extent that the pot is not broken. These two functions of the ring are very important and contribute very materially to the success ,of the machine.

. The device thus has four functions, it cools the glass in a drawingbait, it may be used to cut off the glass cylinder, it protects the glass pot and it prevents the gases from striking the glass cylinder which is being drawn.

What I claim is 1. A cooling and cutting off device for glass cylinders, comprising an annular casting provided in its body with an annular gas conduit and a passage to receive a cooling medium to cool the glass that attaches. to a drawing bait, said gas conduit being arranged to be attached to a gas supply and having a plurality of outlets for directing a series of gas jets against the periphery of the glass cylinder.

2. A cooling and cutting off device for glass cylinders, comprising an annular casting provided in its body with an annular gas conduit and with a chamber surrounding said conduit and arranged to receive a cooling medium to cool the glass that attaches to a drawing bait, said gas conduit being arranged to be attached to a gas supply and having a plurality of outlets for directing a series of gas jets against the periphery of the glass cylinder.

3. Apparatus for cutting off glass cylinders, comprising an annular conduit provided with connections to a gas supply, a-

series of outlets from said conduit arranged to direct jets upon the periphery of the glass cylinder, and a water jacket surrounding said conduit for cooling the same.

4. Apparatus for cutting off glass cylinders, comprising an annular conduit provided with connections to a gas supply, a

series of inwardly extending nozzles spaced at intervals around said conduit for directing gas jets upon the periphery of the glass cylinder, and a water jacket surrounding said conduit for cooling the same.

5. Apparatus. for cutting off glass cylinders, comprising a double walled ring, means for supplying gas to the space within the inner wall of said ring, and a series of outlets from said space for directing gas jets upon the periphery of the glass cyl inder. I

6. Apparatus for cutting off glass cylinders, comprising a double walled ring, means for supplying gas to the space within the inner wall of said ring, a series of outlets from said space for directing gas jets upon the periphery of the glass cylinder, and means for circulating a cooling medium through the space between said walls.

7. Apparatus for cutting off glass cylinders, comprising a double walled ring, means for supplying gas to the space within the inner wall of said ring, and a series of nozzles communicating with the space within the inner wall and extending through. said outer wallfor directing gas jets upon the periphery of the glass cylinder.

8. Apparatus for cuttingofl glass cylinders, comprising a double walled ring, means for supplying gas to the space within the inner wall of said ring, a series of nozzies communicating with the space within the inner wall and extending through said outer Wall for directing gas jets upon the periphery of the glass cylinder, and means for circulating a cooling medium through the space between the two wells of said rlng.

In testimony whereof I have hereunto set my hand.

WILLIAM E. STANDLEY'. Witnesses: v

SUE B. Fnrrz, ELBERT L. HYDE. 

